I have in-laws that live in Wylie. I jumped in creek up there and found a broken scraper over the summer. I have no idea where I was at, I'll ask next time I talk to them.
John, There are many Carrolton Focus and a few Wylie Focus sites around Lake Lavon. Most are situated on points extending into the lake along creek channels and extending into the main river channel. Just be extra careful about watching for the Corp of Engineer baddies!